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Finding the Fourth Proportional to 13,993.88, 20,990.97 and 5,987.56

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Solution

The fourth proportional to 13,993.88, 20,990.97 and 5,987.56 is: 8,981.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,993.88 : 20,990.97 = 5,987.56 : x
  2. Step 2: Convert to fraction form
    13,993.88/20,990.97 = 5,987.56/x
  3. Step 3: Cross multiply
    13,993.88x = 20,990.97 × 5,987.56
  4. Step 4: Simplify right side
    13,993.88x = 125,684,666.54
  5. Step 5: Solve for x
    x = 125,684,666.54/13,993.88
  6. Step 6: Final answer
    x = 8,981.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.